Not really earth shattering as it is the same basic principle as the PHALANX Close In Weapons System and the Navy's longtime use of radar guided 5 inch guns for anti air (incl cruise missiles). I ran a course and also taught at the Navy Guided Missiles School a couple of decades ago and then as an industry guy was part of several Government/Industry Guided Missile Study Groups and Missile Defense Improvement Teams that studied this at length. Although BAE's Precision Guided projectiles are important, the real keys to this are Precision Navigation and Timing for the Gun as well as Real-Time High Bandwidth Communications between Sensor, Shooter and Decisionmaker. Whereas the location of a shipboard 5 Inch gun relative to the Ship's sensors is a known and accounted for difference, in the case of SP Howitzers, the location will vary and the comm paths diverge from secure wired to wireless. The precision tracking information required to interdict a cruise missile requires a lot of data movement thus the need for high bandwidth on a priority basis.